$\frac{dy}{dx}=16x+1$

$\left(\sqrt{b}\cdot\sqrt{5a}\right)^2$

$\left(8x^2-3y^2\right)\left(2ax^3\right)$

$\lim_{x\to0}\left(\frac{7^x-9^x}{x^2}\right)$

$\lim_{x\to1}\left(\frac{x^{x-1}-1}{x^2-1}\right)$

$\lim_{x\to5}\left(\frac{-3x\left|5-x\right|}{x^3-125}\right)$

$14x^2-56$